A truck launched through a guardrail and fell nearly 60 feet from a highway overpass into a crowded San Diego park Saturday afternoon, killing at least four people police said.

Police said several others were injured at Chicano Park, where a group of about 100 people were celebrating the La Raza Run motorcycle festival, according to KNSD.

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The driver is alive but was hospitalized with critical injuries. He also was arrested and charged on suspicion of DUI.